package com.itheima.reggie.controller;


import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    // 原始文件名

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {

        // 原始文件名
        String orginaFilename = file.getOriginalFilename();
        // 后缀开始位置
        String suffix = orginaFilename.substring(orginaFilename.lastIndexOf("."));// .png .jpg

        // 重新设置一个文件名称

        String filename = UUID.randomUUID().toString() + suffix;

        File dir = new File(basePath);
        if (!dir.exists()) {
            dir.mkdir();
        }

        try {
            // 将临时文件转存到指定位置
            file.transferTo(new File(basePath + filename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(filename);

    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            // 输入流 在本地拿文件
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));
            // 输出流

            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes=new byte[1024];
            while ((len = fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            // 关闭资源
            fileInputStream.close();
            outputStream.close();



        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
